B
Post-quantum TLS readiness
www.cnb.cz
Secure today, exposed to harvest-now-decrypt-later
Short answer
No. As of 2026-11-10, www.cnb.cz does not negotiate post-quantum key exchange; it uses x25519 over TLSv1.3 (Quantum Aether grade B), so recorded traffic is exposed to harvest-now-decrypt-later.
| Grade | B |
|---|---|
| Key exchange | x25519 |
| Post-quantum | no (classical) |
| TLS | TLSv1.3 |
| Hosting network | T-Mobile Czech Republic a.s. |
| Country | 🇨🇿 Czechia: #21/23 (35.5%) |
From our weekly tracker of the top 10,000 sites, scanned on 2026-11-10 · /adoption
How to turn on post-quantum key exchange
Step-by-step guides, starting with the one for this site's hosting network:
Show your readiness on your site
Markdown
[](https://ather-quantum.com/verify/www.cnb.cz)